[英]SQL max(DateTime) and category filter without group by
I've written the below query : 我写了下面的查询:
SELECT DateTime, configId, rowId
FROM linkedTableDefinition a,
INNER JOIN tableDefinition b,
ON a.Target = b.Id
INNER JOIN ViewWithInfo c,
ON a.Target = c.Id
This gives the following output: 这给出以下输出:
DateTime configId rowId
12-09-2013 11:00 4 12
12-09-2013 12:00 4 12
12-09-2013 13:00 3 11
12-09-2013 12:00 3 11
12-09-2013 11:00 4 11
What I need of this output is the following: per rowId and configId combination I need the highest value from the datetime column. 我需要的输出如下:每个rowId和configId组合我需要datetime列中的最大值。 So from above example I want the following output:
因此,从上面的示例中,我需要以下输出:
DateTime configId rowId
12-09-2013 12:00 4 12
12-09-2013 13:00 3 11
12-09-2013 11:00 4 11
Does anyone know the answer? 有人知道答案吗? I would like to avoid GROUP BY because the select statement will be extended with a lot more columns.
我想避免使用GROUP BY,因为select语句将扩展更多的列。
Thanks in advance 提前致谢
EDIT The current query: 编辑当前查询:
SELECT testResults.ResultDate, testResults.ConfigurationId, TestResultsTestCaseId
FROM dbo.FactWorkItemLinkHistory workItemLink
INNER JOIN dbo.DimWorkItem workItem
ON workItem.System_Id = workItemLink.TargetWorkItemID
INNER JOIN dbo.TestResultView testResults
ON testResults.TestCaseId = workItemLink.TargetWorkItemID
WHERE
RemovedDate = convert(datetime, '9999-01-01 00:00:00.000')
AND workItemLink.SourceWorkItemID = 7
AND workItem.System_WorkItemType = 'Test Case'
SELECT *
FROM
(
SELECT DateTime, configId, rowId,
ROW_NUMBER() OVER(PARTITION BY configId, rowId ORDER BY DateTime DESC) AS RowNum
FROM linkedTableDefinition a
INNER JOIN tableDefinition b ON a.Target = b.Id
INNER JOIN ViewWithInfo c ON a.Target = c.Id
) src
WHERE src.RowNum = 1
You could do this, substituting proper joining fields as appropriate: 您可以这样做,并适当地替换适当的联接字段:
SELECT testResults.ResultDate, testResults.ConfigurationId, testResults.TestCaseId,
(SELECT MAX(ResultDate) FROM dbo.TestResultView WHERE TestCaseId = testResults.TestCaseId AND ConfigurationId = testResults.ConfigurationId) AS MaxDate
FROM dbo.FactWorkItemLinkHistory workItemLink
INNER JOIN dbo.DimWorkItem workItem
ON workItem.System_Id = workItemLink.TargetWorkItemID AND workItemLink.TeamProjectCollectionSK = workItem.TeamProjectCollectionSK
INNER JOIN dbo.TestResultView testResults
ON testResults.TestCaseId = workItemLink.TargetWorkItemID
WHERE
RemovedDate = convert(datetime, '9999-01-01 00:00:00.000')
AND workItemLink.SourceWorkItemID = 7
AND workItem.System_WorkItemType = 'Test Case'
AND workItem.System_RevisedDate = convert(datetime, '9999-01-01 00:00:00.000')
Dont know much about the columns in your table but it would be something like this.... Query in CROSS APPLY with get the highest TOP 1 date for every result and then feed into the result set or outer query.. 对表中的列了解不多,但是类似这样。...在CROSS APPLY中进行查询,获得每个结果的最高TOP 1日期,然后输入结果集或外部查询。
SELECT configId, rowId, tbl.DateTime
FROM linkedTableDefinition a,
INNER JOIN tableDefinition b,
ON a.Target = b.Id
INNER JOIN ViewWithInfo c,
ON a.Target = c.Id
CROSS APPLY
(
SELECT TOP 1 DateTime
FROM whatevertable
WHERE whatevertable.CommonCol = TabeFrmOuterQuery.CommonCol
ORDER BY DateTime DESC
) tbl
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